Engineering, 2013, 5, 20-25

University of M’sila, Faculty of Technology, M’sila , Algeria
2
University of Setif, Faculty of Technology, Setif, Algeria
Email: messalti.sabir@yahoo.fr
Received 2013

ABSTRACT
A substation is a part of an electrical generation, transmission, and distribution system. Substations generally have
switching, protection and control equipment, and transformers. The low voltage distribution networks are supplied from
MV/LV substation transformer that represent the last step of bringing transformation to the low voltage and ensuring
the protection and monitoring of the network. There are three types of MV/LV substation: pole-mounted transformer
substation, the substation in an envelope and substation in masonry. This paper presents a general description for different MV/LV substation and a methodology to design the various elements making up the public distribution substation (choice of the emplacement, engineering, power transformer, choice of MV cells, circuit breakers, fuses, disconnect
switch, conductors,...etc).
Keywords: Substation Transformer; MV Cells; Substation in Masonry, Pole-Mounted Transformer Substation

The MV/LV substations provide the interface between
the distribution MV and LV. The MV / LV adapts to all
modes of operation and why should fulfill the following
functions:
● Distribute the power and protect the LV departures;
● Isolate the MV/LV substation in case of default;
● Manage the MV network in case of default and the
position by remote control.
MV/LV substation transformer has two purposes:
- The interconnection between the lines of the same
voltage level, it helps to distribute the power of the
different lines from substations.
- The transformation of electrical power, processors
can switch between voltage levels to another.
So, we can classify the MV/LV substations over the
networks on which they are used as well as the functions
they perform. The realization of MV/LV substations
needs prior knowledge:
● Standards of reference and statutory instruments
(voltage, quality of supply, short-circuit power, ...,etc);
● Needs to be performing (power plant availability,
operation);
● Specific needs-related uses (voltage variations tolerated,
compensation of reactive power, immunity to
interference receivers, regulations related to facility
security);
● Constraints, installation and environment [2,3].
This paper presents the different MV/LV substation
transformer and a methodology to design the various
elements making up the public distribution substation.
ENG